linux-kernel - Re: [PATCH 1/2] arm64: bpf: add 'store immediate' instruction

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Message-ID: <56536A62.4040103@linaro.org>
Date:	Mon, 23 Nov 2015 11:34:58 -0800
From:	"Shi, Yang" <yang.shi@...aro.org>
To:	Z Lim <zlim.lnx@...il.com>, Will Deacon <will.deacon@....com>,
	Alexei Starovoitov <ast@...nel.org>,
	"David S. Miller" <davem@...emloft.net>
CC:	daniel@...earbox.net, Catalin Marinas <catalin.marinas@....com>,
	Xi Wang <xi.wang@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH 1/2] arm64: bpf: add 'store immediate' instruction

Hi folks,

Any more comments on this patch (store immediate only)?

I need more time to add XADD (I'm supposed everyone agrees it is 
equivalent to atomic_add). However, this one is irrelevant to XADD, so 
we may be able to apply it first?

Thanks,
Yang


On 11/12/2015 7:45 PM, Z Lim wrote:
> On Thu, Nov 12, 2015 at 11:33 AM, Shi, Yang <yang.shi@...aro.org> wrote:
>> On 11/11/2015 4:39 AM, Will Deacon wrote:
>>>
>>> Wait a second, we're both talking rubbish here :) The STR (immediate)
>>> form is referring to the addressing mode, whereas this patch wants to
>>> store an immediate value to memory, which does need moving to a register
>>> first.
>>
>>
>> Yes, the immediate means immediate offset for addressing index. Doesn't mean
>> to store immediate to memory.
>>
>> I don't think any load-store architecture has store immediate instruction.
>>
>
> Indeed. Sorry for the noise.
>
> Somehow Will caught a whiff of whatever I was smoking then :)
>

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